How many radars are there?

Range is the distance from the radar site to the target measured along the line of sight . The factor of two in the equation comes from the observation that the radar pulse must travel to the target and back before detection, or twice the range.

There are 155 WSR-88D Doppler radars in the United States , including the U.S. Territory of Guam and the Commonwealth of Puerto Rico. Most radars are operated by the NWS or the Department of Defense.

The minimum range capability of a radar is determined primarily by the pulse length. It is equal to half the pulse length of the radar (164 yards per microsecond of pulse length ).